In 2022, the population of Avilla was 100, a 1.01% increase year-by-year from 2021. Previously, in 2021, Avilla's population was 99, a decline of 1.00% compared to a population of 100 in 2020.
The median age in Avilla, MO is 34.5, as per 2021 ACS 5-Year Estimates. Of the total population, 34.38% were under the age of 15, 9.38% aged 15 to 29, 34.38% aged 30 to 64, 18.75% aged 65 to 84, and 3.12% were 85 years of age and older.